The present invention relates to a method of operating a burner and a fluid supply system (100) for a burner, wherein the fluid supply system (100) for the burner comprises a first fluid injector (110) comprising at least one first fluid injection element (111, 112), a second fluid injector (120) comprising at least one second fluid injection element (121, 122), and a valve unit (150) between the first fluid injector (110) and the second fluid injector (120), wherein a fluid is provided to the fluid supply system (100) such that the burner performs flameless combustion or at least semi flameless combustion, wherein if a pressure of the fluid at the valve unit (150) does not reach a predetermined threshold value, the valve unit (150) is closed and the fluid is provided to the burner via the first fluid injector (110) at least with a predetermined flowrate, wherein if the pressure of the fluid at the valve unit (150) reaches the predetermined threshold value, the valve unit (150) opens and the fluid is provided to the burner via the first fluid injector (110) at least with the predetermined flowrate and also via the second fluid injector (120).
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